2001-2006 Honda TRX 300EX Sportrax 300EX Factory Service Manual, Page 53Get this manual
MAINTENANCE Adjus the valve clearances by loosening Ihe lock nut and turning the adjusting screw until there is It slight drag on the feeler gaug8SCREW
TOOLS: Valve adjusting wrench, 10 12 mm 077080030200 or equivalent commel"cielty available in U.S.AV.lve Idlu.Ung wrench 077080030400 Of"
Velve adJulting wrench, mm 07908KE90200 (U.S.Aonlyl
After adjusting the valve clearance, light en the lock nut while holding the adjusting screw